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By Itzik Ben-Gan
Автор книги "SQL Server 2000 XML" подробно и во всех деталях описывает работу с базами данных SQL Server посредством XML документов. Изложение ведется "от простого к сложному", поэтому вначале издания рассматривается сам стандарт XML, затем уже описывается техника извлечения данных из базы с помощью средств FOR XML, обсуждаются возможности представления XML документов как реляционных наборов данных с помощью OPENXML. Автор уделяет внимание XDR и XSD схемам, мотивируя это как средство получения данных через HTTP запросы, использованию Xpath запросов к SQL Server, технологиям модификации баз данных через программы обновления. В книге рассматривается представление XML View в виде одного из средств описания таблиц СУБД. Описываются и практические задачи - демонстрируются техники импорта XML документов в базу данных с помощью программы массовой загрузки XML Bulk Load. Всего в издании five практических примеров, позволяющих убедиться в описанных в книге преимуществах использования XML технологий в работе с СУБД SQL Server 2000. Читатель найдет в издании преимущества и новые возможности релиза internet 2.0, при использовании которого можно организовать XML доступ к базам данных SQL Server 2000.
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Extra resources for Inside Microsoft SQL Server 2008; T-SQL Querying
Sample text
Here I will provide a description of the subphases involved in a join; later in the chapter, under “Table Operators,” I’ll describe the other table operators. The FROM phase generates virtual table VT1. Step 1-J1: Perform Cartesian Product (Cross Join) This is the first of three subphases that are applicable to a join table operator. This subphase performs a Cartesian product (a cross join, or an unrestricted join) between the two tables involved in the join and, as a result, generates virtual table VT1-J1.
Important This step is different than all other steps in the sense that it doesn’t return a valid table; instead, it returns a cursor. Remember that SQL is based on set theory. A set doesn’t have a predetermined order to its rows: It’s a logical collection of members, and the order of the members shouldn’t matter. A query with a presentation ORDER BY clause returns an object with rows organized in a particular order. ANSI calls such an object a cursor. Understanding this step is one of the most fundamental steps to correctly understanding SQL.
Customerid TRUE FRNDO Madrid 1 FRNDO TRUE FRNDO Madrid 2 FRNDO TRUE KRLOS Madrid 3 KRLOS TRUE KRLOS Madrid 4 KRLOS TRUE KRLOS Madrid 5 KRLOS TRUE MRPHS Zion 6 MRPHS Chapter 1 Logical Query Processing 11 Step 1-J3: Add Outer Rows This step occurs only for an outer join. For an outer join, you mark one or both input tables as preserved by specifying the type of outer join (LEFT, RIGHT, or FULL). Marking a table as preserved means that you want all of its rows returned, even when filtered out by the